<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <!-- 方式二 通过事件冒泡-标准写法 -->
    <!-- <view @click="gotoSearch">
      <my-search></my-search>
    </view> -->
    <!-- 方式二 通过事件冒泡-冒泡写法 -->
    <!-- <my-search @click.native="gotoSearch"></my-search> -->
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{ height: wh + 'px' }">
        <view class="left-scroll-view-item" :class="index === active ? 'active': ''" v-for="(item,index) in cateList" :key="index" @click="activeChange(index)">
          {{item.cat_name}}
        </view> 
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{ height: wh + 'px' }" :scroll-top="scrollTop">
        <!-- 二级分类 -->
        <view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="index2">
          <view class="cate-lv2-title">
            / {{item2.cat_name}} /
          </view>
          <!-- 三级分类 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3">
              <image :src="item3.cat_icon" @click="gotoGoodsList(item3)"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
import badgeMix from '@/mixins/tabbar-badge.js'
export default {
  name: 'Cate',
  mixins: [badgeMix],
  components: {},
  data() {
    return {
      wh: 0,
      cateList: [], // 一级分类列表
      cateLevel2: [], // 二级分类列表
      active: 0,
      scrollTop: 0
    };
  },
  created() {},
  mounted() {},
  onLoad() {
    // 获取当前系统的信息
    const sysInfo = uni.getSystemInfoSync();
    this.wh = sysInfo.windowHeight - 50;
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await uni.$http.get('/api/public/v1/categories');
      console.log(res);
      if (res.meta.status !== 200) return uni.$showMsg();
      this.cateList = res.message;
      this.cateLevel2 = this.cateList[0].children
    },
    activeChange(i) {
      this.active = i;
      this.cateLevel2 = this.cateList[i].children
      this.scrollTop = this.scrollTop === 0 ? 1 : 0
    },
    gotoGoodsList(item){
      console.log(item);
      uni.navigateTo({
        url: `/subpkg/goods_list/goods_list?cid=${item.cat_id}`
      })
    },
    gotoSearch() {
      uni.navigateTo({
        url: '/subpkg/search/search'
      })
    }
  }
};
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  .left-scroll-view {
    width: 120px;
    .left-scroll-view-item {
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;

      &.active {
        position: relative;
        background-color: #ffffff;
        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item {
    display: flex;
    width: 33.33%;
    margin-bottom: 10px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    image {
      width: 60px;
      height: 60px;
    }
    text {
      font-size: 12px;
    }
  }
}
</style>
